8321861 has 2 divisors, whose sum is σ = 8321862. Its totient is φ = 8321860.

The previous prime is 8321851. The next prime is 8321881. The reversal of 8321861 is 1681238.

8321861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5452225 + 2869636 = 2335^2 + 1694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8321861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8321801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160930 + 4160931.

It is an arithmetic number, because the mean of its divisors is an integer number (4160931).

Almost surely, 2^8321861 is an apocalyptic number.

It is an amenable number.

8321861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8321861 is an equidigital number, since it uses as much as digits as its factorization.

8321861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 8321861 is about 2884.7635951669. The cubic root of 8321861 is about 202.6469877279.

The spelling of 8321861 in words is "eight million, three hundred twenty-one thousand, eight hundred sixty-one".